摘要:
A liquid level monitoring system for underground storage tanks includes a submersible monitoring pipe having telescoping sections that are spring biased to an extended position enabling the pipe to be self-mounted within the tank between its upper and lower walls adjacent to and offset axially from a selected axis opening in the tank, such as the discharge opening which normally accommodates the pump for the tank. The pipe houses an electronic level sensor which is coupled to an above ground control system via conductor wires. A tank adapter is secured to the tank opening and provided with a passage through which the conductor wires extend for routing out of the tank without interfering with the clearance normally provided for insertion and removal of the pump.
摘要:
A structure and method for producing such a structure of a unique design is disclosed. The structure produced by the features and techniques of this invention comprise a base (16) which is typically supported by the earth (18). The base (16) supports a vertical core structure (14) which extends from the base to a top end. A tension ring (24) is fixedly attached to the top end of the core structure (14). In addition, a compression ring (22) is fixedly attached to the core structure (14). A multiplicity of curved meridian members (26), (28), (30) and (32), extend between the tension ring (24), and the compression ring (22) are of a single selected shape and are circumferentially shaped around the tension ring (24) and the compression ring (22). A multiplicity of radial members (62 through 68) extend horizontal between the core structure (14) and the curved meridian members (26 through 32) and provide structural support for floors and ceilings separating various building levels. In addition, there is a multiplicity of circular hoop members (54 through 60) which provide structural support to the meridian members (26 through 32) to prevent buckling and deformation. Thus, there is provided by this invention a technique for building structures wherein a horizontal cross-section at any vertical location of the three dimensional structure defines a circle.
摘要:
A liquid level monitoring system for underground storage tanks includes a submersible monitoring pipe system having telescoping sections that are biased to an extended position enabling the pipe to be self-retained within the tank between its upper and lower walls adjacent to and offset axially from a selected access opening in the tank, such as the discharge opening which normally accommodates the pump for the tank. The pipe system houses an electronic level sensor which is coupled to an above ground control system via conductor wires. An elongate accessing member having an openable and closable clamp jaw assembly for gripping the pipe system and disposing it in a compressed condition within the tank offset from the riser opening is provided as a part of the system.
摘要:
A method and system for detecting a leak in a high vapor-evolving hydrocarbon liquid underground storage tank filled incompletely with the liquid, wherein there is a projecting fill pipe connected with the ullage which is filled with hydrocarbon vapor and air. A vacuum source is connected to the fill pipe for withdrawing the atmosphere of the ullage and imposing a prescribed negative pressure. While some of the drawn off vapor and much of the air is exhausted to atmosphere, a significant portion of the ullage content is recirculated to build the relative proportion of hydrocarbon vapor to air in the ullage. The ullage is then isolated from the vacuum source and atmosphere, and allowed to stabilize over a predetermined time period with a reduced rate of hydrocarbon vapor release into the ullage. The recirculation and stabilization are then repeated to achieve further saturation of the ullage with gasoline vapor and vacuum is applied to the ullage to reach a predetermined threshold negative pressure in the ullage. Over a predetermined time period successive negative pressure readings are taken to determine if there is a rate of decay which indicates the existence of a leak in the tank.